Mold-box for conduit-joints.



UNITED STATES]- atented DecemberS, i90-?.

PATENT OEEICE.

EUGENE L. DULBOIS,YOF NEW ORLEANS, LOUISIANA.

MOLD-BOX FOR CON DUlT-JOINTS.

SPECIFICATION forming part of Letters Patent No. 746,051, datedDecember 8, 1903.

Application filed May 4, 1903. Serial Ng. 155.537. (No model.)

ana, have invented. certain new and useful Improvements in Mold-Boxes for Conduit- .Ioints,of which the following is aspecication.

My invention relates to removable moldboXes for use in forming a cement packing around the joints of adjacent sections of conduits for underground electric wires; and its obj ect is to improve the structure of the mold members to make them more serviceable and more readily handled and to enable a better packing to be applied around the conduitjoint. The improved mold comprises a pair of cooperating members to be placed at opposite sides of the conduit and having hinged overlapping covers, theside andcover members having flangesadapted to form a continuous pocket for cement around the sides and top of the conduit, and each side member is provided with a bail from which projects a pronged arm adapted to engage the trenchwall to brace the mold member and to serve also as a handle for lifting the mold.

My improvements are illustrated in the accompanying drawings, in which- Figure l is a plan view of the mold in place about a conduit-joint in a trench, the moldcovers being raised to permit the introduction j of cement. Fig. 2 is a similar view showing the covers lowered to the surface of the conduit. Fig. 3 is a sectional elevation on the line w 4w of Fig. l. Fig. 4L is a like View on the lineof liig. 2. Fig. 5 is a similar View showing the mold and packing partly in section, and Figs. 6 and 7 aul detail views of one of the mold members.

In the drawings is shown a trench, at the bottom of which are abutting sections (designated l and 2) of an ordinary conduit resting on a cement bed 3 and separated a suitable distance from the walls l. of the trench.

'Phe mold-sections consist ,of thin metal plates 5, having flanges 6 extending along their sides to form pockets or spaces for receiving cement when the mold-sections are set in upright position at opposite sides of the conduit-joint- Cover-plates 7 are connected to the vertical plates by hinges 8, which allow them to be turned freelyinward or outward, and they are provided with inward iianges 9 for forming a pocket'or space at the top of the conduit-joint for confining cement.

To the ends of the hinge-pintles are swinging bails IO, from which project outward centra] arms ll, having prongs 12 on Vtheir ends.

In using the molds a section is placed at each Side of the conduit-joint, and the bails l0 are swung outward to engage the prongs with the trenclrwalls to hold the molds in place at the sides of the conduit. The covers 7 are also swung outward to slanting positions and are preferably made to rest against the walls of the trench. In these positions they may be utilized as troughs for conductingthe cement to themolds.` When the mold-pockets have been .filled and the cement tamped, a suitable quantity of cement is deposited on top of the conduit, and the covers are then turned inward and downward onto the cement,which can Ybe tamped by pressure or blows on the covers. This operation iinished,the molds can readily be removed by lifting them by their bails.

f The bracing of the molds by means of the bails and arms holds them in place and enables the cement to be applied either before or after the trench is partially filled with earth.

Having described my invention, what I claim, and desire to secure by Letters Patent, is*

' I. A mold for/conduit-joints, comprising a vertical plate having iianges along its side edges adaptingit to form a pocket at the side of the abutting ends of the cond uit-sections, and a cover-plate hinged to the top of the side plate and adapted to fold over the top portion of the conduit-joint, substantially as set forth.

2. A mold for conduit-joints, comprisinga vertical plate having flanges along its side edges adapting it to form a pocket at the side of the abutting ends of the conduit-sections, and a flanged cover-plate hinged to the top of the side plate and adapted to fold and form a pocket over the top portion of the conduitjoint, substantially as set forth.

3. A moldbox for conduit-joints, comprising a pair of plates having iianges along their sides for forming pockets at opposite sides tri IOU

of the joint, and iianged cover-plates hinged to the Vertical plates for forming a pocket over the joint, substantially as set forth.

4;. A moidbox Vfor conduit-joints, comprising a plate having flanges along` its sides adapted to overlap and forni a pocket at the side of the abutting ends of the conduit-seotions, andan arm hinged thereto and adapted to be swung outward to Contact with the trench-Wall to serve as a braee for the mold, substantially as set forth.

A nioidfbox for Conduit-joints, Comprising a plate having I'langes along its sides adapted to overlap and form a pocket at the side of the abutting ends of the eondnit-see tions, a cover-plate hinged to the top thereof and adapted to fold over the eonduit-joint, and having iianges along its sides to forni a pocket at the top of the joint7 and an arm hinged to the mo1d-p1ate and adapted to serve both as a brace and a handle, substantially as set forth.

In testimony whereof I have signed my name to this specification, in the presence of tWo Subscribing Witnesses, this 27th day of April, 1903.

EUGENE L. DU BOIS.

W'itnesses:

P. II. GUNCKEL, H. A. BoWMAN. 

